基于DSP的甲烷浓度检测系统的研究与设计

目前,光干涉型甲烷检测仪性能稳定、使用寿命长,但由于采用人工读数,自动化程度低,测试前,刻度值的标定必须在和待测地点温度相近的进风巷中,捏放吸气球清洗甲烷室,然后校零,防止由于温度气压变化较大而出现零点漂移现象,读数不直观,人为误差较大,不能存储数据.基于此,采用图像分析和信息处理,提出了采用CMOS作为光电转换元件的非接触式测量方式,CMOS输出信号经过模数转换后成为高速的数字图像数据,通过DSP实现对CMOS数字图像数据的采集、存储以及对干涉图像数据的算法分析,最终实现甲烷浓度的高精密测量.

Research and design of precision optical interference methane concentration detection system

Currently,the stable optical interference type methane detector performance,long life,but due to manual reading,the low degree of automation,before the test,in order to prevent the emergence of large temperature changes in pressure calibration zero drift,scale values and must be Location temperature measured close to the inlet Lane,pinch release methane suction ball cleaning chamber,then zeroing.This device is not intuitive readings,human error is large enough to hold the data.Based on this,the use of image analysis and information processing,is proposed as a photoelectric conversion element using CMOS non-contact measurement,CMOS output signal after analog-digital conversion become high-speed digital image data to achieve CMOS digital image data by the DSP collection,storage,and image data for interference analysis algorithms,and ultimately to achieve high-precision measurement of methane concentration.